Table 1.
Mean (standard error) food quality expressed in molar C∶N and C∶P ratios for stock cultures (chemostat), P-poor, P-sufficient and P- rich treatments used in the two experiments.
Figure 1.
Mass-specific P-content in relation to specific growth rates of D. magna, D. pulicaria and D. galeata x hyalina, after four days (closed symbols) and at maturation (open symbols).
Lines were fitted using ANCOVA with quadratic term for P-content.
Table 2.
Results of ANCOVA for the effects of Daphnia body P-content and age (4-day-old juveniles, mature adults) on specific growth rates (GR) of D. magna, D. pulicaria and D. galeata x hyalina.
Figure 2.
Relationships between A) specific growth rates and N∶P ratios, and B) specific growth rate and clutch size for Daphnia magna (circles), D. pulicaria (squares) and D. galeata x hyalina (triangles).
Lines were fitted using ANCOVA.
Figure 3.
Specific growth rates (GR) of 4-day-old D. magna, D. pulicaria and D. galeata x hyalina cultured on P-poor (C∶P 400; open symbols) and P-rich (C∶P 80, closed symbols) algal food at four food concentrations (0.08, 0.14, 0.2 and 0.3 mg C L−1).
Lines were fitted using the Monod model.
Figure 4.
Threshold food concentrations (C0±95% CI) supporting zero specific growth rates of 4-day-old D. pulicaria and D. galeata x hyalina cultured on P-poor (C∶P 400, open bars) and P-rich (C∶P 80; filled bars) algal food.
C0 values are parameter estimates from the Monod model.